Feature spec
Goal: Send a clear invoice after finishing a job.
- Add a client, line items, a due date, and payment instructions.
- Preview the total before exporting a PDF.
- Keep an editable draft if export fails.
App Overview
eVario - Variometer Pro-W
eVario is your connected flight navigation companion during and after your adventure trip, helping you to visualise relevant data, assist you while progressing in the air by returning visual and acoustical feedback.
$6.99 · In-app purchases
PRICE
$6.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included15 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.
States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.
Differentiate and validate
Hypothesis: Contractors need faster repeat invoices more than more templates.
First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.
The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.
Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.
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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for eVario - Variometer Pro-W: map the core Sports workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.
Hypothesis 1
Allow users to customize the metrics they track.
Assumption to check: Limited customization options for performance metrics
Validate with people who use this workflow before building.
Hypothesis 2
Implement social features to share performance data.
Assumption to check: Lack of real-time data sharing with friends
Validate with people who use this workflow before building.
Hypothesis 3
Enable offline data access and storage.
Assumption to check: No offline capabilities
Validate with people who use this workflow before building.
Hypothesis 4
Offer more features in the base app or lower the price.
Assumption to check: High price point for a basic app
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
eVario is your connected flight navigation companion during and after your adventure trip, helping you to visualise relevant data, assist you while progressing in the air by returning visual and acoustical feedback. eVario is a 9-axis measurement (accelerometer, gyrometer, gps), barometer assisted, connected and intuitive instrument with a polychrom display, exploiting the embedded device’s hardware and accurate sensoric, without need to connect external devices. It typically provides real time information of a variometer like altimeter, speedometer, odometer, chronometer, gyrometer, anemometer for every (air)craft pilot. Its configurable cockpit allows you to keep track of the most relevant to you. The integrated data logger automatically records your 3D location and provides the recorded track file to e.g. your iCloud Drive for track visualisation or flight metrics. Turn on & Fly! No need for additional/external hardware. eVario is mainly designed for paragliding/hang-gliding, but may be used as well while biking, hiking, running, sailing, skiing, flying, … Optimised for low battery usage, the app lets you: ▶ TOUCH&GO: Turn on & Go fly! The cockpit shows real-time data after a short automatic instrument calibration. ▶ TAKE OFF: Automatic track recording is taking place in background and take-off altitude is referenced. ▶ STAY IN CONTROL: Control the behaviour, update rate, unit of the instruments, anytime and anywhere. ▶ THERMALLING: Get acoustical and visual feedback of the encountered thermals and easily locate them when returning back. ▶ BE EFFICIENT: Track wind estimation, direction and force, to soar or prepare your landing. ▶ DO MORE: Review your activity track and metrics in Health app or replay your 3D flight e.g. in GoogleEarth, Analyse flight metrics in BaseCamp. KEY FEATURES *Cockpit ▶ Clear dashboard of digital real time data ▶ Unlimited GPS tracks and waypoints saves ▶ Support of metric and imperial unit system ▶ Support of GPX record formats ▶ Automatic tracking start/stop upon movement detection ▶ Automatic GPS track recording ▶ Logbook with individual 3D GPS track records (timestamp, latitude, longitude, elevation) supporting derived data analysis *Map ▶ Visualise your position on map *Tracks ▶ eVario integrates with Health app to record your track data including eVario specific metric data. ▶ Visualise your flight record in Health app More on the developer's website.
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Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
React Native
Expo
react-navigation
axios
react-native-chart-kit
zustand
BUILD KIT DIFFICULTY
Advanced
From the Build Kit assessment.
A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.
